Do you have OEM CA emissions / smog equipment still in place? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Steeveedee** · 11-21-2017, 10:44 PM

My truck has the Federal emissions package, so I can't take pictures to help you. However, if you need to see what was used, the Chassis Service Manual has pictures and schematic diagrams of the systems used, to help you. Someone here was gracious enough to scan in the entire manuals for a number of years; you should be able to find what you may need from those manuals.

**DeadheadNM** · 11-21-2017, 10:49 PM

Quote:

Originally Posted by Steeveedee

My truck has the Federal emissions package, so I can't take pictures to help you. However, if you need to see what was used, the Chassis Service Manual has pictures and schematic diagrams of the systems used, to help you. Someone here was gracious enough to scan in the entire manuals for a number of years; you should be able to find what you may need from those manuals.

Thank you! The manual had an example from 68 - some brackets differed. I couldn't find a schematic for 72. It helps having the other blazer to reference. I'm curious how these systems differed over the years and for AC vs non-AC trucks and what problems if any others have with their systems. Granted many or most systems were probably tossed out long ago.

**davischevy** · 11-21-2017, 11:34 PM

I can take more if you need them. I guess I should have called and let you look at it early that morning when I came back through Albuquerque.

**davischevy** · 11-21-2017, 11:36 PM

BTW, mine has what sounds like an exhaust leak. I had new exhaust installed, but the noise is still there. Do you have any ideas.

Coley · 11-22-2017, 12:07 PM

Quote:

Originally Posted by davischevy

BTW, mine has what sounds like an exhaust leak. I had new exhaust installed, but the noise is still there. Do you have any ideas.

Check the back of the emissions unit for a vacuum port.
It looks like the vacuum line from the (california/emissions) carb has been plugged (in your 1st pic) and I believe this normally runs to the emissions unit.

Coley

**davischevy** · 11-22-2017, 05:34 PM

Quote:

Originally Posted by Coley

Check the back of the emissions unit for a vacuum port.
It looks like the vacuum line from the (california/emissions) carb has been plugged (in your 1st pic) and I believe this normally runs to the emissions unit.

Coley

Thanks, I'll check it out.

11-21-2017, 10:44 PM	#1
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,166	Re: Do you have OEM CA emissions / smog equipment still in place? My truck has the Federal emissions package, so I can't take pictures to help you. However, if you need to see what was used, the Chassis Service Manual has pictures and schematic diagrams of the systems used, to help you. Someone here was gracious enough to scan in the entire manuals for a number of years; you should be able to find what you may need from those manuals. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

11-21-2017, 11:34 PM	#3
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,795	Re: Do you have OEM CA emissions / smog equipment still in place? I can take more if you need them. I guess I should have called and let you look at it early that morning when I came back through Albuquerque. Attached Images __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

11-21-2017, 11:36 PM	#4
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,795	Re: Do you have OEM CA emissions / smog equipment still in place? BTW, mine has what sounds like an exhaust leak. I had new exhaust installed, but the noise is still there. Do you have any ideas. __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.



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